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Finding the Fourth Proportional to 78,785.69, 108,764.40 and 60,840.41

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Solution

The fourth proportional to 78,785.69, 108,764.40 and 60,840.41 is: 83,990.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,785.69 : 108,764.40 = 60,840.41 : x
  2. Step 2: Convert to fraction form
    78,785.69/108,764.40 = 60,840.41/x
  3. Step 3: Cross multiply
    78,785.69x = 108,764.40 × 60,840.41
  4. Step 4: Simplify right side
    78,785.69x = 6,617,270,689.40
  5. Step 5: Solve for x
    x = 6,617,270,689.40/78,785.69
  6. Step 6: Final answer
    x = 83,990.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.